There is no vehicle that I know of that ever used both filaments at the same time for high beams.
The low beam filament is shielded to direct the light towards the road and away from oncoming traffic.
The high beam filament is centered in the reflector and unshielded.
Looking at your dimmer switch, you can plainly see that your choices are one or the other but not both.
Along the way, there have been many changes in legal requirements for vehicle lighting. At one point, only sealed beam headlights were allowed. Somewhere around 1980 they began to allow separate bulb and reflector. Before sealed beams, there were quite an assortment of bulb and reflector devices. Also, at some point, there were federal regulations on the allowed candle power of headlights.
Personally, I have not kept up with the regulations, but at no time were the high and low filaments allowed to illuminate together TO THE BEST OF MY KNOWLEDGE.
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